[panic]在某些网络比较差的场景下，quic_read函数出现panic，帮忙看下是否有遇到过

[sharewzy]

1121.zip

网络比较差的情况下会出现以下crash异常。

11-21 14:41:45.154 29267 29508 F libc : Fatal signal 11 (SIGSEGV), code -6 (SI_TKILL) in tid 29508 (NGairChannel), pid 29267 (atwall.cloudapp)
11-21 14:41:45.510 29815 29815 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
11-21 14:41:45.510 29815 29815 F DEBUG : Build fingerprint: 'Adayo/salvator/salvator:9/PQ2A.190405.003-RELtest-r8a7795/Jenkins10311754:userdebug/test-keys'
11-21 14:41:45.510 29815 29815 F DEBUG : Revision: '2.0'
11-21 14:41:45.510 29815 29815 F DEBUG : ABI: 'arm64'
11-21 14:41:45.510 29815 29815 F DEBUG : pid: 29267, tid: 29508, name: NGairChannel >>> com.greatwall.cloudapp <<<
11-21 14:41:45.510 29815 29815 F DEBUG : signal 11 (SIGSEGV), code -6 (SI_TKILL), fault addr --------
11-21 14:41:45.510 29815 29815 F DEBUG : x0 0000f6699bc23ae0 x1 0000f669b21aeb62 x2 0000000000000000 x3 0000000000000000
11-21 14:41:45.510 29815 29815 F DEBUG : x4 0000f669a7cf17e0 x5 0000f6699ed9dacc x6 695f6362696c5f5f x7 000000002cdf996e
11-21 14:41:45.510 29815 29815 F DEBUG : x8 0000000000000000 x9 0000f669cd6e2ca8 x10 0000000000000400 x11 00000000ffffffff
11-21 14:41:45.511 29815 29815 F DEBUG : x12 0000f669ae66d280 x13 0000000000000000 x14 000000000000000c x15 0000000000000000
11-21 14:41:45.511 29815 29815 F DEBUG : x16 0000f669b21c6bc8 x17 0000f66a51edf100 x18 0000f6699bc10718 x19 0000f669bf67b8a4
11-21 14:41:45.511 29815 29815 F DEBUG : x20 0000000000000400 x21 0000f6699eab5300 x22 0000f66a51ec1000 x23 0000f669b21c7db8
11-21 14:41:45.511 29815 29815 F DEBUG : x24 0000f669b21fef18 x25 0000f669a780b588 x26 0000f669b21ff030 x27 0000f669ad7ab544
11-21 14:41:45.511 29815 29815 F DEBUG : x28 0000f669addf10a0 x29 0000f669bf67b880
11-21 14:41:45.511 29815 29815 F DEBUG : sp 0000f669bf67b860 lr 0000f669b21955c4 pc 0000f669b21955d8
11-21 14:41:45.523 29815 29815 F DEBUG :
11-21 14:41:45.523 29815 29815 F DEBUG : backtrace:
11-21 14:41:45.524 29815 29815 F DEBUG : #00 pc 000000000000d5d8 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x2621000) (GetAbortMessageBeforeQ+164)
11-21 14:41:45.524 29815 29815 F DEBUG : #1 pc 000000000000b13c /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x2621000) (dumpAbortMessage+120)
11-21 14:41:45.524 29815 29815 F DEBUG : #2 pc 0000000000008f08 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x2621000)
11-21 14:41:45.524 29815 29815 F DEBUG : #3 pc 0000000000000664 [vdso:0000f66a53157000]
11-21 14:41:45.524 29815 29815 F DEBUG : #4 pc 0000000000021ab8 /system/lib64/libc.so (abort+120)
11-21 14:41:45.524 29815 29815 F DEBUG : #5 pc 0000000000979c58 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (std::sys::pal::unix::abort_internal::h22ff110bbc1699b8+4)
11-21 14:41:45.524 29815 29815 F DEBUG : #6 pc 0000000000970f4c /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (rust_panic+88)
11-21 14:41:45.524 29815 29815 F DEBUG : #7 pc 0000000000970d20 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (std::panicking::rust_panic_with_hook::h934a8048af49d358+660)
11-21 14:41:45.524 29815 29815 F DEBUG : #8 pc 0000000000970a28 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.524 29815 29815 F DEBUG : #9 pc 000000000096e344 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.524 29815 29815 F DEBUG : #10 pc 00000000009707ec /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (rust_begin_unwind+44)
11-21 14:41:45.524 29815 29815 F DEBUG : #11 pc 0000000000993724 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (core::panicking::panic_fmt::ha067cbb55934613d+44)
11-21 14:41:45.524 29815 29815 F DEBUG : #12 pc 00000000009937a4 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (core::panicking::panic::h7675799b3abc9261+48)
11-21 14:41:45.524 29815 29815 F DEBUG : #13 pc 0000000000704e88 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.524 29815 29815 F DEBUG : #14 pc 00000000006fa458 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.524 29815 29815 F DEBUG : #15 pc 0000000000646c28 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (tquic::connection::Connection::stream_read::h77f509fb12033833+148)
11-21 14:41:45.524 29815 29815 F DEBUG : #16 pc 00000000005fb5c0 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (quic_stream_read+408)
11-21 14:41:45.524 29815 29815 F DEBUG : #17 pc 00000000005e1398 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairChannel::recvExcatllyLength(void*, int)+436)
11-21 14:41:45.524 29815 29815 F DEBUG : #18 pc 00000000005e19a0 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairChannel::recvMsgBody()+88)
11-21 14:41:45.524 29815 29815 F DEBUG : #19 pc 00000000005e1810 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairChannel::recvOneMessage()+132)
11-21 14:41:45.524 29815 29815 F DEBUG : #20 pc 00000000005e1a3c /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairChannel::recvMessages()+32)
11-21 14:41:45.524 29815 29815 F DEBUG : #21 pc 00000000005dabe8 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairClient::notifyStreamReadable(int)+56)
11-21 14:41:45.524 29815 29815 F DEBUG : #22 pc 00000000005daba0 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (client_on_stream_readable(void*, quic_conn_t*, unsigned long)+384)
11-21 14:41:45.524 29815 29815 F DEBUG : #23 pc 00000000005fc2cc /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (_$LT$tquic..ffi..TransportHandler$u20$as$u20$tquic..TransportHandler$GT$::on_stream_readable::h6658f8158140c6ac+132)
11-21 14:41:45.524 29815 29815 F DEBUG : #24 pc 0000000000666ef4 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.524 29815 29815 F DEBUG : #25 pc 0000000000666408 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (tquic::endpoint::Endpoint::process_connections::hf2d34023b1d473b4+564)
11-21 14:41:45.525 29815 29815 F DEBUG : #26 pc 00000000005f98dc /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (quic_endpoint_process_connections+20)
11-21 14:41:45.525 29815 29815 F DEBUG : #27 pc 00000000005d7f50 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairClient::processConnection()+28)
11-21 14:41:45.525 29815 29815 F DEBUG : #28 pc 00000000005d8a78 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.525 29815 29815 F DEBUG : #29 pc 00000000005f27d8 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (ev_invoke_pending+184)
11-21 14:41:45.525 29815 29815 F DEBUG : #30 pc 00000000005f2cb8 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (ev_run+1224)
11-21 14:41:45.525 29815 29815 F DEBUG : #31 pc 00000000005e6890 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000)
11-21 14:41:45.525 29815 29815 F DEBUG : #32 pc 00000000005e6860 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairLooper::startLooper()+36)
11-21 14:41:45.525 29815 29815 F DEBUG : #33 pc 00000000005d7fe0 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (GairClient::startGairClientLooper()+24)
11-21 14:41:45.525 29815 29815 F DEBUG : #34 pc 00000000005d7b24 /data/app/com.greatwall.cloudapp-vP1WdB-5yBPcTGPmpRDkcA==/base.apk (offset 0x28b6000) (gairClientThread(void*)+1504)
11-21 14:41:45.525 29815 29815 F DEBUG : #35 pc 0000000000083114 /system/lib64/libc.so (__pthread_start(void*)+36)
11-21 14:41:45.526 29815 29815 F DEBUG : #36 pc 00000000000233bc /system/lib64/libc.so (__start_thread+68)

[iyangsj]

目前没有遇到类似问题。请问使用的tquic协议库版本是多少？每次偶发出现panic的调用栈是否相同？是否有复现的方式

[iyangsj]

从日志中调用栈初步分析，问题由于访问内存非法导致。
发生panic最顶层的函数调用是 tquic::connection::Connection::stream_read()，而不是stream_read()函数进一步调用的函数，因此可以先排除line 3849/3850/3852/3857；而函数中剩余行似乎不可能发生core，除非内存被破坏 （例如Connection对象已被释放）